heedless
unheeding
airy
aloof
anyhow
anyway
anywise
apathetic
at all
at all costs
at all events
at any cost
at any rate
ataractic
behindhand
blase
bored
by any means
careless
casual
cursory
degage
delinquent
derelict
despite
detached
devil-may-care
disinterested
dispassionate
disregardant
disregardful
distant
distracted
distrait
easygoing
even with
flippant
forgetful
free and easy
however
impassive
in any case
in any event
in any way
in despite of
in spite of
inadvertent
inattentive